+2 on the don't buy an os vg. mine only lasted 2 gallons and i have been running nitro for 10+ years. The VG just doesn't hold up.
I wouldn't buy a cheap servo either. Spend a few extra bucks and get a pair of Ace or AE 1313. They are fast, strong, and durable.
For engines, I would suggest GO 3, 5, 7 port, RB S5, jammin jpx. 21. Those engines are in the low $200 range and will give you much better life and performance than a OS VG.